1) By default, the UPDATE STATISTICS statement updates both index and column statistics.Using the COLUMNS option of this statement will update column statistics only.Using UPDATE STATISTICS WITH FULLSCAN will scan the entire table.
Let me show you how these commands work with some examples using the Adventure Works database. Sales Order Detail Use the previous sys.stats query to verify that two statistics objects were created, one for the Sales Order ID column and another one for the Order Qty column (they both have names starting with _WA_Sys as shown later).
Run the following statement to create an index on the Product ID column.
One of the questions I was asked recently while speaking at the Los Angeles SQL Server Professionals Group and the Orange County SQL Server User Group (*) was regarding the order in which jobs like rebuilding indexes or updating statistics should be executed as part of the database maintenance activities.
In general you should consider the following important points, focusing in the fact that there are two kinds of statistics: index and column statistics.
Since the first job only updates index statistics and the second one only updates column statistics, it does not matter which one you execute first.
Some other more complicated scenarios include when you have jobs which rebuild your indexes based on their fragmentation level.Using the INDEX option will update index statistics only.2) By default, the UPDATE STATISTICS statement uses only a sample of records of the table.PDF (US Ltr) - 38.2Mb PDF (A4) - 38.2Mb PDF (RPM) - 37.6Mb HTML Download (TGZ) - 10.2Mb HTML Download (Zip) - 10.3Mb HTML Download (RPM) - 9.0Mb Man Pages (TGZ) - 197.4Kb Man Pages (Zip) - 305.9Kb Info (Gzip) - 3.5Mb Info (Zip) - 3.5Mb My SQL Backup and Recovery My SQL Globalization My SQL Information Schema My SQL Installation Guide My SQL and Linux/Unix My SQL and OS X My SQL Partitioning My SQL Performance Schema My SQL Replication Using the My SQL Yum Repository My SQL Restrictions and Limitations Security in My SQL My SQL and Solaris Building My SQL from Source Starting and Stopping My SQL My SQL Tutorial My SQL and Windows My SQL NDB Cluster 7.5 My SQL 5.7 Secure Deployment Guide column definitions can specify the current timestamp for both the default and auto-update values, for one but not the other, or for neither.Different columns can have different combinations of automatic properties. Our primary goal is to improve producer access to equitable markets while building regional capacity to supply the growing consumer demand for high quality lamb and goat meat.